Answer:
The guard felt he had broken his oath to not come to the king's presence again, but this time, it was on good tidings. He had come to tell the good news of the capture of the culprit who had disobeyed the King's orders.
He referred to himself as "the lucky man" because he was to bring the good news of the capture to the king.
Explanation:
Sophocles' play "Antigone" revolves around the story of Antigone and how she bravely opposed the king to do right by her brother. The story deals with themes of family, loyalty, love, pride, tyranny, etc.
The sentry/ guard had promised not to come to the king's presence "But whether caught or not . . . you won't see me coming here again." But now, he was only too happy to bring the good news to the king, the good news being capturing whoever has disobeyed the king's order. The culprit was Antigone, who the guards had caught red-handed trying to give her brother, the dead Polyneicês, a proper burial despite King Creon's order that he's a traitor and be left without a proper burial.
He referred to himself as "the lucky man" because he is bringing the good news of the capture of the culprit who had disobeyed the king's order.
